Using Virtual AP takes long time to connect?

I have an AP with one Virtual AP set up on it, the master AP has no security and the virtual one has WPA2 PSK.

It takes 5-7 minutes to connect an mikrotik client to this AP. No logs say any problems? Once its connected it stays connected, and throughput is good, so no big deal, but is there a reason for taking so long?

it is too long. What is your client?
Try enabling wireless,debug logs to see what happens when the client tries to connect.

I’ve successfully done an AP with both the master being wpa2/psk and the virtual being open, and the master being open and the virtual being wpa2/psk. I’ve used MT, NS2, Laptop in this situation.

Done the same, no problems. 2 V AP’s, WPA2 for primary, WEP for mine, open for public.

You do have different SSID’s for each AP and V AP?